I ride with my tracker everyday BC and any in-bound pow day.
Pack, shovel, probe, first-aid, survival gear, fod and water, and partners are essential every time. Being in the BC without it just fucking retarded.
There is a interesting thread over on TGR on what people carry in the BC. Here is my list. Not all of this goes out everytime, but most of it is usually with me.
DaKine Poacher Pack
BCA Tracker
G3 300cm Probe
BD Tele Lynx Shovel
Med Kit
Sam Splint
Life Link Snow Saw
Small Maglite
Duct Tape - some on maglite and some on ski pole
Topo Map of area
Lighter, Matches, and Fire starter goo
2 Glow sticks
Cell Phone (off)
Compass
8x Magnifier and Snow pit card
Slopemeter
Space Blanket
Extra Contacts + solution
Extra layers - usually compressed down jacket
Extra Batteries - just in case beacon dies (I never let my tracker get below about 75% battery power) + for maglite
Extra Flexon Boot Buckles - Love the boots, hate the buckles, and sometime they need to be replaces while skiing
Sunscreen + sunglasses
Carmex
Bandana
2 extra power bars, 2 extra cliff goo crap
Normal Food and Water
Hand Warmers
DaKine Leatherman tool
Toe Nail Clippers - ingrown toenails suck
head lamp
BD Whippet Poles
Whistle
Optional stuff
60cm BD Raven Ice Axe
Crampons
Homemade Cornice Rope
basically, most of that stuff just stays in my bag at all time.
Beacons, even trackers, should be practiced with as much as possible. Batteries checked frequently. Even inbounds I often feel weird without it.